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extension UIView {
    class func fromNib<T: UIView>() -> T {
        return Bundle.main.loadNibNamed(String(describing: T.self), owner: nil, options: nil)![0] as! T
    }
}

//Then call it like this:
let myCustomView: CustomView = UIView.fromNib()

//..or even:
let myCustomView: CustomView = .fromNib()